Une methode de synthese generale de systemes cycliques carbones, fonctionnalises a ete developpee sur la base de cyclisationsradicalaires intramoleculaires de composes carbonyles dichloro-2,2 etheniques et acetyleniques, catalysees par des complexes du fer ou du ruthenium
Intramolecular metal catalyzed kharasch cyclizations of olefinic α-halo esters and acids
作者:Gary M. Lee、M. Parvez、Steven M. Weinreb
DOI:10.1016/s0040-4020(01)86169-x
日期:1988.1
Functionalized carbocyclic compounds are produced by intramolecular Kharasch radical cyclization reactions catalyzed by various transition metal complexes. Several unsaturated mono-α-haloesters and acids can be efficiently transformed to γ-halocarboxyl and γ-lactone carbocycles via exo closure of a 5-hexenyl type radical intermediate. The cyclization methodology is useful for synthesis of both fused and bridged
[GRAPHIC]Pyrrolidines and bicyclic pyrrolidine derivatives can effectively be synthesized from gamma-iodoolefins using commercially available chloramine-T (CT) as a nitrogen source. The cyclization proceeds with high stereoselectivity via a cyclic iodonium intermediate.
Transition metal catalyzed intramolecular cyclizations of (trichloromethyl)alkenes
作者:Gary M. Lee、Steven M. Weinreb
DOI:10.1021/jo00291a034
日期:1990.2
Cascade Radical Reactions Catalyzed by a Pd/Light System: Cyclizative Multiple Carbonylation of 4-Alkenyl Iodides
Cascade reactions of 4-alkenyl iodides, involving a carbonylation-cyclization-carbonylation sequence, were accomplished by a hnu/Pd system. The stereochemical outcomes suggest that radical carbonylation and subsequent acyl radical cyclization may be involved in this reaction.
LEE, GARY M.;WEINREB, STEVEN M., J. ORG. CHEM., 55,(1990) N, C. 1281-1285